Burr roller



Oct. 3, 1939. L. c. IMUNDT El AL BURR ROLLER Filed March 31) 1955INVENTOR. Loans 0'. MUNDT ALBERT LRoco.

. 61M ATTORNEYS.

Patented Oct. 3, 1939 UNITED STATES BURR ROLLER.

Louis 0. Mundt and Albert L. Roco, Houston, Tex., assignors to Leslie A.Layne, Houston,

Tex.

Application March 31, 1936, Serial No. 71,830

Claims.

The invention relates to a burr roller of the type which will eliminateburrs projecting on the inside of a pipe or other structure.

In the operation of perforating pipe for various 5 purposes where theholes are drilled through the wall of thepipe it is, of course, theusual and customary practice to move the drill toward the center of thepipe. Naturally the drill in penetrating the middle of the hole willleave a small projecting burr around the periphery of the hole which hasbeen drilled, and this is particularly true where speed in operation ismaintained and where a gang drill is used.

The invention has a particular application to the removal of the burrson the inside of perforated pipe which is to be used for screens orstrainers in wells.

It is desirable to remove the burrs because such burrs will act as anobstruction in the pipe 30 and encourage the accumulation of silt, sandand otherwise interfere with a more efficient operation of the screen.

Various devices have been provided for removing the burrs on the insideof the pipe, but the present invention has been devised with a view ofsimplifying the operation and eliminating the burrs throughout thelength of the pipe section.

It is one of the objects of the invention to provide a burr roller whichmay be pased into a section of pipe to smooth off any projecting burrs.

Another object of the invention is to provide a burr roller whichcarries a plurality of spools which will move outwardly by centrifugalforce to strike the burrs with a suificient impact to re- 85 move theburrs.

Another object of the invention is to provide a burr roller with spoolswhich move outwardly by centrifugal force but in which the spools aregeared so that the expansion will be uniform with 40 all of the spools.

Another object of the invention is to' so connect the several spools ofa burr roller that a burr having contact with one of the spools isstruck with the centrifugal force which is applied to all 46 of theseveral spools.

Another object .of' the invention is to provide in combination with aburr roller a centering device which will hold the roller centralized inthe pipe so as to uniformly remove the burrs.

50 Other and further objects of the invention will be readily apparentwhen the following description is considered in connection with theaccompanying drawings wherein:

Fig. 1 is a vertical sectional view of a pipe sec- I, tion in which theburr roller is in operation.

Fig. 2 is a section taken on the line 22 of Fig, l and illustrating theradial arrangement of the spools.

Fig. 3 is a magnified view of a pipe section illustrating theperforations before and after the 5 passage of the burr roller.

Fig. 4 is an elevation of one of the spools showing the camber thereof.

In Fig. l the pipe which is to be operated upon is illustrated generallyat 2 and has been per- 10 forated with a plurality of openings 3 whichhave been formed by moving the drill radially inward through the wall ofthe pipe. Naturally as the drill completes the opening there will be asmall amount of the metal material such as 4 which will be distorted andmoved inwardly to form a burr such as 5.

Fig. 3 shows a magnified form of this burr wherein the distortedmaterial 4 has been carried inwardly with the drill in order to permitpassage 20 of the drill through the opening, it being understood thatthe general type of drill used for this work is a twist drill. Fig. 3,of course, is magnified considerably in order to emphasize the effectthat a burr of this type will have on form- 25 ing an obstruction on theinside of the pipe and to illustrate diagrammatically the problem whichis being solved.

It will be noted that the material 4 has been moved from a positionwithin the opening 3 to a 3 position perpendicular to the wall 6 of thepipe so that there has already been a severe stress placed on thematerial 4 where it is connected to the wall 2. In other words thismaterial at the corner I has been bent beyond its elastic limit becauseit remains in the position shown in the drawing which is difierent fromits original position. In other words, this material 4 is more or lessbrittle because it has already been distorted and is quite readilyremoved by a pounding action. The tendency is for this material 4 tobreak off at the corner I where it joins with the pipe wall 6. Thelefthand side of Fig. 3 shows an. opening 3 wherein the burr. has beenremoved and the inside surface ill of the wall 6 is smooth and the burrhas been removed as an obstruction.

The machine for removing the burrs is best seen in Fig. l and comprisesa shaft l5 which has a drive wheel or pulley l6 affixed to one endthereof. It will be understood that this shaft must be of considerablelength if it is to project from the pipe 2 because in many instancespipes of this type have a length of twenty or thirty feet and the burrroller must be passed throughout the length of the pipe.

The pulley I6 is provided with an area i! to receive a belt or otherdriving mechanism which can be driven from a suitable source of power toimpart rotation to the shaft |5. It is desirable that this shaft |5rotate at a relatively high rate of speed approximating 3000 to 5000revolutions per minute. The bearing I8 supports the outer end of theshaft in a housing l9 and this housing may be of considerable length andis joined to a sleeve 20 by the threaded connection 2|. Another bearing22 is carried by the sleeve 20 .to support the shaft |5 in the sleeve.Any desired number of bearings may be placed along the housing |9 inorder to suitably maintain the shaft against excessive vibration.

The inner end of the shaft l5 is carried in a bearing 23 and a stopcollar 24 serves to prevent end play of the shaft l5.

A driving head 25 carries a shank 25 which is threaded into the end ofthe shaft |5 so that it will be compelled to rotate therewith. Ashoulder 2'! is formed adjacent the shank 26 and is arranged to abutagainst the end of the shaft I5 so that when the head is screwed tightlyinto the end of the shaft that the drive torque will be transmitted fromthe end of the shaft to this shoulder 21.,

From this point the head 25 is enlarged to include a plate 23 whichforms part of the frame or head. This frame also includes an end member29 which is spaced from the plate 28 by a plurality of connecting bolts30. Three such bolts are seen in Fig. 2 and mounted thereon for pivotalmovement is an arm 3| and a link 3| which are spaced apart to receivethe roller 35 between them. The arm 3! is of particular construction andwith the link 3| carries the roller shaft 32. The arm 3| is providedwith a plurality of teeth such as 33 on the inner side. As seen in Fig.2 there are three of these arms, but any desired number may be provided.

Each arm 3| carries a roller' 35 on its roller shaft 32 which ispreferably of solid metal and will therefore have considerable weight,the inertia of which is available for smoothing the burrs on the insideof the pipe. These rollers are seen in Fig. 1 in elevation and may havea straight cylindrical surface or they may have a cambered or curvedsurface 31 as seen in Fig. 4.

A small pinion gear 50 is pivoted on a stud shaft 4| carried by theplate 28 as seen in Fig. 2 and this pinion has teeth thereon which meshwith the teeth 33 formed on all of the arms 3|. It seems obvious fromthis construction that because of the fact that these arms are gearedtogether in this manner that any swinging movement of one of the armscan only occur when the other arms are permitted to effect a similarswinging movement.

It should be noted that the arms 3| and roller 35 are eccentricallymounted with respect to the shafts 30 so that when the head 25is rotatedthe roller will have a tendency to swing circumferentially outward aboutthe shaft 30 as a center. The swinging movement of each arm is limitedby the fact that the last tooth on each arm is of greater width as seenat 42 so that it cannot pass between the teeth of the pinion 69.

In order that the entire mechanism will be suitably centered within thepipe 2 a spring actuated centering mechanism is shown generally at 50.This includes a pair of links 5| and 52, the links 52 being. pivoted at53 to a collar 54 which is fixed on the sleeve 20. The link. 5| ispivoted at 56 to a sliding; collar 51 which. is arranged for telescopingmovement on the sleeve 20. The adjacent ends of the links 5| and 52support a shaft 58 which carries a guide roller 59. There are aplurality of these arrangements carried by the collars 54 and 51 so thatthey will tend to support the sleeve 20 and the shaft IS in acentralized position in the middle of the pipe 2.

A spring 60 is confined between the shoulder 6| on the sleeve 20 and theend 62 of the sliding collar 5'! so that it normally tends to urge the"guide roller 59 radially outward. The amount of pressure exerted bythis spring is sufficient to support the roller mechanism in the pipe,it being understood when the machine is forced into the pipe that theguide roller 59 will be compressed.

In operation the mechanism is inserted in the end of the pipe as seen inFig. 1 and the shaft l5 compelled to rotate at a high rate of speed. i

Because of the considerable weight of the rollers 35 and the fact thatthey are eccentrically mounted on the bolts 30 will cause them to swingoutwardly by centrifugal force. They will, of course, contact the insidesurface 10 of the pipe and inasmuch as they are rotating at a high rateof speed they will strike the burr portions 4 and either flatten theportion down against the inside of the pipe l0 so that it forms littleor no obstruction, or by striking the burr a sharp blow will break itfrom its connection with the wall of the pipe .so that the burr isremoved completely. This is illustrated by the difference between thetwo openings in the pipe as seen in Fig. 3, the burr having been removedfrom the left-hand opening. The same is also illustrated in Fig. 1 wherethe burr portion 4 is seen on those openings which have not been passedby the roller.

It is to be understood that power from any suitable source may be usedto rotate the roller mechanism such as the present shaft, or it may be"driven by fluid pressure if desired by incorporating a fluid pressuremotor adjacent the head 25 and substituting a pipe for the shaft |5 sothat fluid pressure can be conducted to the fluid motor.

Particular attention is directed to the fact that all of the rollers arecompelled to maintain the -same radial distance from the center ofrotation. This is of advantage because when one roller strikes a burrthat particular .roller cannot be moved inwardly by theburr which isstruck unless. the obstruction. is of suflicient strength to overcomethe centrifugal force .of all three of therollers, because the rollerwhich strikes the burr starts to move inwardly which compels a turningmovement of the pinion 40 which in turn tends to rotate'the other armsand rollers inwardly. This coupling together of theseveral rollers.enables the use of a small roller ,of a suitable weight that it can berotated at a high speed, yet associating the weight of all of therollers together for the purpose of striking the blow against the burr.It seems obvious that a blow approximating many hundreds of pounds canbe struck by one of these small rollers when it is rotatingat a highrateof speed.

Broadlytthe invention contemplates a high speedrotating head which willserve to eliminate the burrs on the inside of a pipe which has beenperforated.

What is claimed is:

' 1. A burr --roller to remove the burrs resulting from the perforationof pipes comprising a head i5? slidable longitudinally in a pipe, aplurality of rollers thereon, means mounting each roller in an eccentrictransverse swinging position on said head, said means including an arm,and interengaging means on said arms and said head whereby all of saidrollers are caused to swin in unison.

2. A burr roller comprising a support, a rotatable head thereon, aplurality of uniformly movable means eccentrically mounted on said headto swing outwardly by centrifugal force upon rotation of said head, saidmeans including roller members to strike the burrs adhering to theinside of the pipe and additional means to center said support in thepipe being burred so that all of said means will bear uniformly on theinside of the pipe.

3. In a burr roller, a rotatable head, a plurality of burr rollersmounted thereon to swing outwardly against the burrs due to centrifugalforce upon rotation of said head, and means to control all of saidrollers so that the swinging movement is uniform, the mountings for saidrollers including shafts axially disposed on said head and arranged foreccentric movement transversely of the axis of the head.

4. In a burr remover, a rotatable head, a plurality of burr removersmounted thereon to swing outwardly against the burrs due to centrifugalforce upon rotation of said head, and means to control the swingingmovement of any one remover to the same movement as the other removersincluding eccentric arms swingable transversely of the axis of saidhead.

5. A burr remover head comprising spaced end plates, bolts connectingsaid plates, a pair of arms pivotedf on each bolt, a shaft carried byeach pair of arms, a pinion gear carried by one of said plates, andteeth on one arm of each pair which are engaged with said pinion so thatall of said removers are restrained to the same amount of movement.

LOUIS C. MUNDT. ALBERT L. R000.

